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We consider the initial boundary value problem for a Petrovsky system with nonlinear dampingin a bounded domain. We showed that the solution is global in time under some conditions without the relation between m and p. We also prove that the local solution blows-up in finite time if p > m and the initial energy is nonngeative. The decay estimates of the energy function and the estimates of the lifespan of solutions are given. In this way, we can extend the result of ([6]).

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